Maybe I'm not fit for a AWD car.
A lot of these posts are helpful and/or hilarious, but still a bit too focused on the cause of jerkiness and not explaining the metal-on-metal noises that the thread-starter seems to be worried about. I would have expected more comments on things like CV joints, differential pins, and slop in the T-case, to go with my suggestion that it's the loading/unloading of the front suspension making the top-mount do its thing.
Plus, you started a thread that includes some very interesting posts. (Although, when I did some googling starting with "negative feedback loop" I ended up on a wiki page that was about "homeostasis" which made me a bit mad because I ain't like that ... not that there's anything wrong with it, of course.)
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From: PA
Nahh i don't wanna do it........I myself don't think i'm helping the car by doing it just by accident....Everything seems to be working ok an no Service AWD system light came on yet.
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From: California
Plus, you started a thread that includes some very interesting posts. (Although, when I did some googling starting with "negative feedback loop" I ended up on a wiki page that was about "homeostasis" which made me a bit mad because I ain't like that ... not that there's anything wrong with it, of course.)
I'll give it another try.
It's definitely your flux capacitor. Have you tried sending 1.21 gigawatts to it and seeing what happens?
It's definitely your flux capacitor. Have you tried sending 1.21 gigawatts to it and seeing what happens?
Last edited by SilverShadow03; Jun 5, 2014 at 03:12 PM. Reason: Posted Corrected Gigawatts to push through flux capacitor. Thanks ztkraptor for catching that!
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From: Pittsburgh
I been driving sticks since i was 16 i am 25 now...i could go 1 mph with no throttle in my front wheel drive cars do it in this car it rocks back an forth like its gonna stall out an makes that metal on metal noise coming from the front end....Should i ride the clutch so i don't have this problem...I prefer not to.
I just wanted to know if anyone knew what that noise is coming from the front end its something in the differential for sure an like i said it sounds like a pin smacking off a piece of metal.
I just wanted to know if anyone knew what that noise is coming from the front end its something in the differential for sure an like i said it sounds like a pin smacking off a piece of metal.
it will be worse when the car is hot/weather is hot becuase there's just a hair more room for rattle.
I'm trying to explain it in laymen terms as to what is occurring.
I'm not sure how much I can clear it up any more than i already have tried to.
I will try once more.
First, let me try to explain in a general sense what happens when you have a car in gear, and you are using its momentum to carry the car. (this normally occurs when going down a hill)
There is no fuel being sent to the cylinders at this point as the ECU is able to detect that work is being done by the wheels onto the crank.(I hope you all can understand this concept)
This happens in any gear, so long as the potential energy of the car is being transferred as it moves.(An example of this is when you clutch drop a car to start it[aka pushing the car and letting the clutch out in gear in order to spin the crank shaft of the motor])
Anyway.
What is happening in this instance, is that when you are a low speed in a low gear, and your car is moving under its own momentum, the fuel to the cylinders is shut down. The engine is NOT producing power. Due to the slow speed at which you are traveling, the compression of the air in the cylinders is harder to overcome. Since there is no combustion going on in the other cylinders to help with the motion the car begins to slow, at a point the ECU realizes(As someone stated earlier) that it requires a combustion to keep the engine spinning.
At this point, there is an oscillation occurring.
What I mean by this, is you are slowing down, your potential energy is turning the crank though the wheels on the road, at some point, the potential energy being transferred is not enough to keep the engine spinning. The ECU kicks in and fires off a few strokes..then it shuts down the flow again. This happens many times a second and this is why you are jerking.
As I stated earlier, you can all test this in your car, and see when the fuel is no longer flowing to the cylinders, and when you press on the gas you can almost sense when the fuel kicks back in.
I wrote this in a hurry, and will try to fix some of the terminology later.
I hope that you can understand what is going on here.
I'm not sure how much I can clear it up any more than i already have tried to.
I will try once more.
First, let me try to explain in a general sense what happens when you have a car in gear, and you are using its momentum to carry the car. (this normally occurs when going down a hill)
There is no fuel being sent to the cylinders at this point as the ECU is able to detect that work is being done by the wheels onto the crank.(I hope you all can understand this concept)
This happens in any gear, so long as the potential energy of the car is being transferred as it moves.(An example of this is when you clutch drop a car to start it[aka pushing the car and letting the clutch out in gear in order to spin the crank shaft of the motor])
Anyway.
What is happening in this instance, is that when you are a low speed in a low gear, and your car is moving under its own momentum, the fuel to the cylinders is shut down. The engine is NOT producing power. Due to the slow speed at which you are traveling, the compression of the air in the cylinders is harder to overcome. Since there is no combustion going on in the other cylinders to help with the motion the car begins to slow, at a point the ECU realizes(As someone stated earlier) that it requires a combustion to keep the engine spinning.
At this point, there is an oscillation occurring.
What I mean by this, is you are slowing down, your potential energy is turning the crank though the wheels on the road, at some point, the potential energy being transferred is not enough to keep the engine spinning. The ECU kicks in and fires off a few strokes..then it shuts down the flow again. This happens many times a second and this is why you are jerking.
As I stated earlier, you can all test this in your car, and see when the fuel is no longer flowing to the cylinders, and when you press on the gas you can almost sense when the fuel kicks back in.
I wrote this in a hurry, and will try to fix some of the terminology later.
I hope that you can understand what is going on here.
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